It is
very difficult to keep the nose of a short wheelbase vehicle pointed
uphill when the hill is slick and wheelspin is required. They'll get
sideways on you in a big hurry. And, if you don't get your
foot out of it quickly enough, you can wind up rolling down the hill
sideways. Not fun.

When
encountering a diagonal, off-camber situation (where the vehicle is "balancing"
on two opposite corner wheels), a long wheelbase vehicle is much
more stable and far less likely to roll. I hate rolling.

And, of
course, there's never enough room to store all of your stuff you need
to carry on the trail.